What ⌣ means
It marks a curve that opens upward.
Mathematical character tables also list “Cup” as a name for it and give \smile as its LaTeX command.
Don't confuse it with
1Questions people ask
1Is ⌣ an emoji?
No. It is a text character whose appearance comes from the active font; the surrounding notation gives it its mathematical role.
How to type ⌣
Windows (Word)
Alt+XType 2323, then Alt+X to get ⌣.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “smile”.
Linux
Ctrl+Shift+UType 2323, then Enter or Space.
HTML
⌣CSS
\2323Codes and encoding1 code points
HTML decimal
⌣
HTML hex
⌣
CSS content
content: "\2323";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%8C%A3
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.